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Audacity is a free, easy-to-use audio editor and recorder for Windows, Mac OS X, GNU/Linux and other operating systems. You can use Audacity to:

Record live audio.Convert tapes and records into digital recordings or CDs.Edit Ogg Vorbis, MP3, WAV or AIFF sound files.Cut, copy, splice or mix sounds together.Change the speed or pitch of a recording.Add new effects with LADSPA plug-ins. And more!